cassel



Nrrnn STATES PATENTL einen,

. IIEN'RY'R. CASSEL, OF lrllllll YORK, N. Y.`

Paesi-:ss oF EXTRACTING GOLD Feromonas.

SPEGIFICATION"for1ning part of Letters Patent No. 578,721, dated March 16, 189'?.

Original application flied September 10, 1396s gel-15,1 No, 605,'34f, Divicleflrancl this application filed November 24, 1896.

Serial No. 613,340. (No specimens.)

To a/ZZ wiz/m it 11mg/ concern: I i

Be it known that I ,IIENRY R. CASSEL,'a citizen of the UnitedStates, residing at New Yorkvcity, in the county ot' New York and State of New York, have invented certain new and useful Improvements in Processes ot' Extracting Gold from Orcs; and I do declare-the tion of the invention, such as will enable following to be a full, clear, and exact deseripothers skilled in theart to which it appertains to make and use the saine, reference being hadto the'aeeompanjving` drawing, and to the letters ofV reerenee markedy thereon, which forni a part of this speciliea-tion.

"lhis invention relates to a division ot apv pliea'tion liled by metiepteinber l0, 1906, un-

der Serial No. 605,35. In that applica-tion I describe-a process of subjecting aeidified aurii'erous ore to the action of a solutionof a broinin compound of analkaline base, so as to produce active bromin in intimate oon-tact with the ore, whieh will rapidly dissolve the gold.'

The presentv invention I 'elates to a revers-al of the said steps in the above process.

Instead of treating the aeidifie'd ore hy a solution of a breniin eo inpo und of an alkalinev base I lirst impregnato. the oro with such bro-` min solution andthen add'the acid to liberate the broinin. l

The accomuna-nylug drawing represents a A sectional elevation of one forni of anapparatus for carrying my invention int-o eieet.

The apparatus is fully described in the applica-tion above referred to, to which reference is hereby made. l

Briefly stated, o, is the openore-vat; l), the tank eontainii'ig,` the broinin solution; c, the acid-tank; d, the evaporating-tank; e, the air-compressor; f, the @hierin-Cylinder; g, the

. tower; it, the tank for the alkaline solution,

'anti -z the preeipitating-tank The vat o is charged with pulverizod ore,

which is before or after introduction impregnated with asol-ution of. a broininjconipound of an alkaline base admitted from tank l). This bronii'n solution is made as follows:` l mix asointion of an alkali, suoli as sodium or potassi nin hgvdroxid or its equivalent, with broniin. 'If caustic. soda is used, I take about one pound .of this hydroxd'dissolved in Water-tor two pounds of bromin; but the stren gtli of thesolutiou may oi"v coursev be regulated.

After thoroughly 'im pregnatng the `ore with the above solution and while the ore is in a quiescent state I admit gradually from tank c diluted acid of sulieient strength to conibine-with the alkali and set free the b'romin.

in the nascent or active state or in the form oi' oxyacids. This bromin being in intimate Contact with the ore exerts a powerful dissolving act-ion upon the gold.

To prevent the escape of bromin fumesv lVithin the tower q the subdivided bro'inin combines with an alkaline solution admitted from tank l, to forni a 'tresh'broinin solution oi an alkaline base, which iiows into tank b for continuous use upon a fresh body of ore,

The gold solution is drawn from tank il into the precipitating-tank t', where the gold is precipitated byhydrogen sulidtibr in any other manner.

1`What I elaiin is- Y The method of extracting `gold from ores which consists in gradually pereolating an acid solution through a body of ore iinpreg hated with a solution oi a hi'oniin compound of an alkaline base, the ore being maintained in a quiescent state during percolation, suo 4 stantially as speeitied.

In t'estiinon,v whereof l affix my signature in presence of two witnesses.v

HENRY' It. CASSEL.

Witnesses: I

I?. v'. BRIESEN, ll-"iLLiAn SCHULZ. 

